Mysql.php
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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2017 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace think\db\connector;
use PDO;
use think\db\Connection;
use think\Log;
/**
* mysql数据库驱动
*/
class Mysql extends Connection
{
/**
* 解析pdo连接的dsn信息
* @access protected
* @param array $config 连接信息
* @return string
*/
protected function parseDsn($config)
{
$dsn = 'mysql:dbname=' . $config['database'] . ';host=' . $config['hostname'];
if (!empty($config['hostport'])) {
$dsn .= ';port=' . $config['hostport'];
} elseif (!empty($config['socket'])) {
$dsn .= ';unix_socket=' . $config['socket'];
}
if (!empty($config['charset'])) {
$dsn .= ';charset=' . $config['charset'];
}
return $dsn;
}
/**
* 取得数据表的字段信息
* @access public
* @param string $tableName
* @return array
*/
public function getFields($tableName)
{
$this->initConnect(true);
list($tableName) = explode(' ', $tableName);
if (false === strpos($tableName, '`')) {
if (strpos($tableName, '.')) {
$tableName = str_replace('.', '`.`', $tableName);
}
$tableName = '`' . $tableName . '`';
}
$sql = 'SHOW COLUMNS FROM ' . $tableName;
// 调试开始
$this->debug(true);
$pdo = $this->linkID->query($sql);
// 调试结束
$this->debug(false, $sql);
$result = $pdo->fetchAll(PDO::FETCH_ASSOC);
$info = [];
if ($result) {
foreach ($result as $key => $val) {
$val = array_change_key_case($val);
$info[$val['field']] = [
'name' => $val['field'],
'type' => $val['type'],
'notnull' => (bool) ('' === $val['null']), // not null is empty, null is yes
'default' => $val['default'],
'primary' => (strtolower($val['key']) == 'pri'),
'autoinc' => (strtolower($val['extra']) == 'auto_increment'),
];
}
}
return $this->fieldCase($info);
}
/**
* 取得数据库的表信息
* @access public
* @param string $dbName
* @return array
*/
public function getTables($dbName = '')
{
$this->initConnect(true);
$sql = !empty($dbName) ? 'SHOW TABLES FROM ' . $dbName : 'SHOW TABLES ';
// 调试开始
$this->debug(true);
$pdo = $this->linkID->query($sql);
// 调试结束
$this->debug(false, $sql);
$result = $pdo->fetchAll(PDO::FETCH_ASSOC);
$info = [];
foreach ($result as $key => $val) {
$info[$key] = current($val);
}
return $info;
}
/**
* SQL性能分析
* @access protected
* @param string $sql
* @return array
*/
protected function getExplain($sql)
{
$pdo = $this->linkID->query("EXPLAIN " . $sql);
$result = $pdo->fetch(PDO::FETCH_ASSOC);
$result = array_change_key_case($result);
if (isset($result['extra'])) {
if (strpos($result['extra'], 'filesort') || strpos($result['extra'], 'temporary')) {
Log::record('SQL:' . $this->queryStr . '[' . $result['extra'] . ']', 'warn');
}
}
return $result;
}
protected function supportSavepoint()
{
return true;
}
}